Home Inspection State Practice Exam 2026 - Free Home Inspection Practice Questions and Study Guide

The correct answer is that pea gravel is not a type of pool filter. When discussing pool filtration systems, there are several common types that are widely recognized and used. Sand filters, cartridge filters, and diatomaceous earth (DE) filters are all legitimate and effective types of filtration systems.

Sand filters work by using a bed of sand to trap and remove debris and contaminants from the water as it passes through. Cartridge filters use a replaceable filtration element to trap dirt and debris, which makes them easy to maintain. Diatomaceous earth filters employ a powder made from fossilized algae, which provides a very fine level of filtration, capturing even smaller particles that other filters might miss.

Pea gravel, on the other hand, is not used as a standalone filtering medium in any type of pool filter. While it can be used in some construction applications or in the placement of various components of a pool setup, it does not serve the purpose of filtering pool water. Thus, it is not classified as a type of pool filter, making it the correct choice in this context.